Main Jet DGV, DFV, ICT EPC 110

Achieve Precision Fuel Delivery with the EMPI .110 Main Jet

Precision is everything when you are dialing in your air-cooled powerplant for maximum efficiency and power. This EMPI .110 Main Jet is the surgical tool you need to achieve the perfect stoichiometric ratio for your Weber DGV, DFV, or ICT, as well as the popular EMPI EPC series carburetors. Whether you are battling a mid-range stumble or looking to optimize your fuel economy for a long-distance cruise to the next VW show, having the correct main jet size is non-negotiable. These jets are manufactured to exacting tolerances, ensuring that every drop of fuel is metered consistently, preventing the lean conditions that lead to catastrophic overheating or the overly rich conditions that foul plugs and waste expensive gasoline. When you install high-quality EMPI brass components, you are investing in the longevity of your engine''s internal components.

Tuning a progressive or dual carb setup on a Volkswagen flat-four requires patience and the right hardware. The .110 size is a critical component for those fine-tuning their fuel delivery curves, particularly in smaller displacement engines or high-altitude environments where oxygen density is lower and a smaller orifice is required to maintain the proper air-fuel balance. Don''t settle for "close enough" when it comes to your engine''s health. By swapping out your main jets, you are taking direct control of the high-speed circuit, ensuring that when the butterflies open, your Bug, Bus, or Ghia responds with crisp, clean acceleration rather than a hesitation. These jets are a staple in any serious VW mechanic''s tuning kit, providing the reliability and performance that Appletree Auto customers have come to expect for decades.

Vehicle and Carburetor Fitment Guide

This main jet is designed for a wide array of air-cooled Volkswagen applications and various aftermarket carburetor conversions. Please verify your carburetor model before ordering.

• Volkswagen Beetle / Bug: All years equipped with Weber or EMPI conversion kits.
• Volkswagen Bus / Transporter / Type 2: Ideal for dual ICT or progressive DGV setups.
• Volkswagen Karmann Ghia: Fits all models using Weber-style performance carburetors.
• Volkswagen Type 3 (Squareback, Fastback, Notchback): Compatible with dual EPC or ICT kits.
• Volkswagen Thing (Type 181): Perfect for upgrading stock fuel systems to performance carburetors.
• Carburetor Compatibility: Fits Weber DGV, DGAV, and DGEV Progressive Carburetors.
• Carburetor Compatibility: Fits Weber DFV, DFAV, and DFEV Progressive Carburetors.
• Carburetor Compatibility: Fits Weber ICT 34 Single or Dual Carburetor Sets.
• Carburetor Compatibility: Fits EMPI EPC 34 and EPC 38 Series Carburetors.
• Carburetor Compatibility: Fits Holley 5200 Series (Weber licensed variants).

Technical Specifications and Materials

• Jet Orifice Size: .110mm (Precision drilled for flow consistency).
• Construction Material: Heavy-Duty Machined Brass for corrosion resistance and durability.
• Thread Type: Standard Weber/EMPI Main Jet Pitch for easy installation and removal.
• Markings: Stamped with size "110" for easy identification in your jet box.
• Circuit Type: Main Fuel Circuit (High-speed circuit).
• Manufacturing Standard: EMPI Certified Quality Control.
• Unit Quantity: Sold Individually (Sold as 1 unit).

Expert Pro Tips from Appletree Auto

Pro Tip 1: Eliminate Vacuum Leaks Before Re-Jetting

Before you begin swapping out your main jets to solve a driveability issue, it is absolutely vital to ensure your engine is free of vacuum leaks. Air-cooled VW engines are notorious for leaks at the intake manifold boots, the carburetor base gaskets, and the throttle shafts. A tiny vacuum leak will lean out your mixture, making you think you need a larger main jet when you actually just need a new gasket. Use a can of carburetor cleaner or a propane wand to spray around the intake areas while the engine is idling; if the RPM changes, you''ve found a leak. Fix the leak first, or you will find yourself chasing a tuning ghost that no amount of jetting can fix.

Pro Tip 2: Master the Art of Reading Your Spark Plugs

Your spark plugs are the "window" into your combustion chamber. To properly test if a .110 main jet is correct for your application, perform a "plug chop." Drive the vehicle at a sustained high-speed cruise (where the main jet is active) for several minutes, then safely pull over and shut the engine off immediately without letting it idle. Remove a spark plug and inspect the ceramic insulator. A light tan or "coffee with cream" color indicates a perfect mixture. If the plug is white or blistered, you are too lean and need a larger jet. If it is black and sooty, you are too rich and the .110 might be exactly what you need to lean it back out for better performance.

Pro Tip 3: Change Only One Variable at a Time

When tuning Weber or EMPI carburetors, it is tempting to change the main jet, the air corrector, and the emulsion tube all at once. This is a recipe for frustration. Always change one component at a time and test drive the vehicle between changes. If you are installing this .110 main jet, keep your idle jets and air correctors the same so you can accurately feel how the fuel curve shifts at higher RPMs. Document every change in a notebook, including the ambient temperature and how the car felt. This systematic approach is how professional engine builders achieve that legendary "